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3.17 omp_get_num_threads – Size of the active team

Description:

Returns the number of threads in the current team. In a sequential section of the program omp_get_num_threads returns 1.

The default team size may be initialized at startup by the OMP_NUM_THREADS environment variable. At runtime, the size of the current team may be set either by the NUM_THREADS clause or by omp_set_num_threads. If none of the above were used to define a specific value and OMP_DYNAMIC is disabled, one thread per CPU online is used.

C/C++:
Prototype:int omp_get_num_threads(void);
Fortran:
Interface:integer function omp_get_num_threads()
See also:

omp_get_max_threads – Maximum number of threads of parallel region, omp_set_num_threads – Set upper team size limit, OMP_NUM_THREADS – Specifies the number of threads to use

Reference:

OpenMP specification v4.5, Section 3.2.2.